A) Drag Coefficient
What happens when you give the ball a gentle sideways push? Why?

When we give the ball a gentle sideways push, it returns to its initial position above the fan. The air particles around the fan have a velocity equal to zero since they are still air. Therefore, the velocity of the air particles above the fan is higher than the velocity of the air particles around the fan. Thus, according to Bernoulli’s Law:

So as the velocity increases, the formula suggests that the pressure decreases. Since the velocity above the fan is larger than the velocity around it, the pressure around the fan is larger than the pressure above the fan. The net force F = ΔP.A that acts on the ball is from the high pressure area(surrounding) to the low pressure area(above the fan) which makes the ball return to its initial position.

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